The types of jokes a person shares and enjoys outside of the office by and large are not a reflection of character, even when they are racist, sexist, or some other -ist. In fact that's the very reason that they are funny, because they are counter to norms. There's nothing immature or childish about this if you're not oversocialized.
Believe it or not, it's possible to be a competent programmer and decent human being while occasionally indulging in an off color joke. Humor is a form of release. You've lived a sheltered life if you're unaware of how perfectly normal and nearly ubiquitous so called "locker room talk" is.
Your post is a perfect example of a dangerous overreaction. Suddenly liking the wrong post makes me an "incel" and keeps me from contributing to society. Isn't that a little crazy?
If most of your social media posts are you liking racist, sexist or some other ist content, I will avoid you. Who wouldn't?
The idea one can judge what someone thinks based on context-free metadata without actually talking to them, reading what they've written, or judging what they've done is hilarious. It's so fundamentally at odds with how human beings work and think (specifically with respect to satire[0] and irony) that it beggars belief. If Charlie Chaplin were alive today and acting out one of his greatest satires[1] on Twitter, a certain well known German dictator would be part of the punchline. But so too would be you, for taking it at face value.
[0] https://en.wikipedia.org/wiki/Satire#Social_and_psychologica...
[1] https://en.wikipedia.org/wiki/Charlie_Chaplin#The_Great_Dict...