All of that is on you, that’s a you problem. Not his. Not ours. Not anyone else, but you.
If you feel like you have to be “closeted” or can only act a certain way, because of those around you… I am sorry you feel trapped in that, or embarrassed. But you can’t police people because of your own judgemental biases. Especially if they are causing absolutely no harm.
And I should note, there are people out there in any fandom that act super EXTRA, and it’s sometimes really not for me, not my scene, not how I act… but I could care less, they are happy living that way, I am happy living my way, and we all enjoy the thing we are fans of, coexisting peacefully.
But in all honesty, this guy is acting normal in the photos, and does not come across as a cringey fan doing cringey things. And even if he did… who cares?