I think this is generally true, and we have to accept it. BUT it's not the case with us - Everton fans. Sadly we give stick to all of our players, regardless of race. I don't think, e.g. Walcott, DCL, Iwobi have got any more than Davies, Keane and Siggy, for instance.
This is a different story though which I think is bad. Yes it doesn't look good to post luxurious, expensive stories on social media when most fans are either stuck at home, not doing too well this year financially, and a lot of evidence suggests they couldn't really be arsed with fighting for Everton this year. It just looks better if you maybe post later. However, one thing I always don't like about our fans is that we don't seem to ever support our players unconditionally. Why can't we just support a player just cos they're ours, and then leave it to the manager to decide about them? We're not deciding whether they play or not!?