The same people criticising him for his Saudi move are the same people who hold up signs saying "Queers for Palestine" and their support for a country that throws LGBT+ people off of buildings.
LGBT+ people like Joe Lycett and Alex Scott were critical of the World Cup being in Qatar and demanding boycotts, until it was revealed that they happily worked in the country to earn money.
Essentially (and no one wants to admit it) it is about jealousy of earning all that money, and people take great pride in being able to bring someone else down.
The LGBT+ community think that they have ownership over allies and can basically control them, JKR has seen what happens, and now Jordan Henderson in being polite and friendly to LGBT+ has now seen how nasty they can be.
As someone else has said, all that it's meant is a drop in LGBT+ support from footballers because it's not worth the hassle.