Don't know why you're asking Gwazi, since he barely visits Tumblr -- I'm the white Catholic cishet who frequents the place and keeps dragging in stuff from there. XD
At any rate, I think you'll be fine -- the average Tumblr experience isn't nearly as bad as all the stereotypes surrounding the place,
especially if you just follow blogs about stuff that you're interested in and don't delve too deep into the social justice stuff.
Additionally, if you're
really worried, there's also an app for Chrome (and probably also Firefox) called "Tumblr Savior" that blocks out any posts containing certain keywords -- and it works very well as a substitute for any sort of actual similar feature on the site.
And besides, so long as you don't actively say anything racist/sexist/etc? I doubt you'll face the wrath of the lynch mobs... Personally, the worst I've come across is the occasional post that makes me feel mildly uncomfortable about being white or whatever. It's really not that bad.
And if you
do see anything really bad? You can just unfollow whoever posted it. Easy.
Oh and, hell, there have even been times when
I've posted extremely controversial opinions (at least... by Tumblr's standards) and gotten by with a minimal amount of anon hate. :P Plus, unless you make a post that becomes
super popular... everyone's going to forget about anything you said before long.
And also! You'd be surprised at what sort of opinions are floating out there. For every shitty, stereotypically Tumblr thing, there are a bunch of other middle-of-the-road posts that stand as an antithesis to that, still promoting social justice but in a sane way, and exposing the shittiness behind some of the more hostile ways of doing things.
I'd stay away from political stuff, though, since Ted Cruz is
definitely not popular -- well, aside from all the memes about him being the zodiac killer -- but... unless you actively express strong support for him and make long posts about why you think he's the best candidate... I doubt anyone will be sending death threats your way anytime soon. >_>
And if you see too many anti-Cruz posts that rub you the wrong way, then, like I said, it's fairly easy to stay away from the content you dislike by just unfollowing the people who post that kind of stuff. I know Tumblr is often criticized as being an echo-chamber where it's easy to surround yourself with solely like-minded people,
buuuut... sometimes that's for the best.
Here's my blog, if you want to follow me. Admittedly I do reblog
some social justice stuff, and my views probably don't completely align with all of yours, but... yeah. It's mostly a blog for fandom stuff and text posts and memes and all that.
Also, Beatles. Lots and lots of Beatles. Like
soooo much Beatles stuff that it outweighs all the other fandoms I post about
(though I've been meaning to start following people from other fandoms to get a bit more variety...), but uh, yeah, if you're content scrolling past some stuff that you may-or-may-not like, then I'd love to have you as a follower. XD
ALSO!!! If you see a post where you agree with the overall message of a post but you think the wording of it is too mean or manipulative or there's a comment like "who the hell doesn't reblog this??" or "I see you people scrolling past this!!" then
don't be tempted by it. It's a manipulative trick and it's just going to pressure you into reblogging it even if you don't completely agree with it and then your followers will
also be similarly pressured. It's just mean-spirited all around. If you don't whole-heartedly agree with a post, then don't be pressured into reblogging it (you'll be doing your followers a favor, besides).
Edit: Point is!! Your dash and your blog should be your happy place and you shouldn't have to worry so much about what you say. There are a ton of tools available to help you ignore/block whatever it is that you don't want to hear, and there's nothing wrong with using them. It's surprisingly easy to stay out of drama if you don't allow yourself to get dragged into it in the first place. o_o
Edit2: I'd like to emphasize how useful Tumblr Savior is. Not only is it great if you want to avoid social justice stuff, but it's
also very convenient for avoiding spoilers for fandoms you're not caught up on. :P OH! And I also recommend XKit -- the more time you spend on Tumblr, the more you'll become aware that the staff have no idea how to run a website, and you'll start seeing more and more features that you want to change -- as well as more great features being removed that you want to change back. Xkit makes it easy to customize Tumblr to make it a lot easier to use, so you can ignore all the shitty decisions the staff make. (I also strongly recommend the "nested" reblog format as opposed to the way the site looks now, cuz
maaaan you don't know what you're missing. It's just
so much cleaner to look at... and the staff taking it away is what made me get Xkit in the first place, because I couldn't stand switching to the ugly format that the Tumblr staff apparently preferred. DX )