It's not about him annoying people because he wore a Juve shirt. It's that he knows it'll add to the already constant furore around him. Purposely shit stirring is a little daft and not majorly professional. I'm not sure why people can't grasp that. It's not rage inducing nor is it agenda driven for most. It's just not a very likeable trait, hence why I can at least understand the backlash.
The reason why no one else has it aimed at them is because no one else is linked with a team whose shirt they're wearing after years of questionable performances and questionable attitude (perhaps in a large part often wrongly questioned) while taking up a big share of the wage budget. It's that he knows his dedication to United has been questioned in the past yet still chooses to do it. It's not terrible, and there are far worse things to worry about, but at least acknowledge why people might not be rushing out to get his name on the back of their shirt about it.
Maybe he is just actually giving people the benefit of the doubt that they wouldn’t try to turn his friend contracting a disease that has literally changed the world would even be distilled down to the choice of shirt. Which is clearly to generous a benefit to give, so even then, he chose to literally spell it out, so that it was not left ambiguous. Yet football loyalties and opinions supersede everything for most, to the extent where their thought is to think Pogba wants to troll United fans rather than maybe GENUINELY being more concerned with showing support for his friend.
Said it earlier in this thread, but God help him if he chooses to take a sick Spanish old lady into his home during this crisis! People are so consumed that the first thing would be that she is Spanish! Take a day off guys.