The NFL has a largely conservative audience, and conservatives are generally disapproving of gay people, so if they see a prominent figure acting visibly queer in any way, they're revulsed by it.
There's a video of him calling our mom to tell her he made the team, this went viral a few days ago in a good way. But now, a 10 second clip of him doing the cheer routine on the field is going viral in a bad way.
The take artists haven't actually been able to articulate why it's bad in any way, just vaguely saying "this isn't normal.......," or implying it's wrong to be gay for some reason and teasing him for it.
People are also outright lying and saying he's the first male cheerleader on the team, or even in the whole NFL. It's useless to correct this because that's not the point, the lie is intentional. A simple "shut the fuck up" suffices.
It's pretty easy to laugh this stuff off, it's random trolls getting dumb jokes off, it'll blow over in a week and conservatives will be mad at a different minority. But i'd be lying if I said it hasn't gotten under our skin.
The best/worst example: the WorldStarHipHop page posted about it but they put an AI filter over him that made him look like Bradley Cooper.
Thankfully our irl community, the actual Eagles fanbase, and the team have all been very supportive and the overall reaction has been mostly positive.
Edit: thanks guys. Go birds DH!