I don't think that influencers are necessarily self-absorbed. It is just another way of doing marketing or public relations - it needn't be done from Dubai, though .
What I do think, however, is that the mental health movement is being hijacked by popular phrases and memes which do more harm than good. 'Be kind' is all very well in itself, and had a meaning (albeit vague) when Caroline Flack died. People maybe did need reminding that nasty comments online would have an impact on their victims. But when it is taken to mean 'Don't hold anyone to account for anything', and is read alongside memes that suggest you cancel anything you don't fancy doing on the day, only do things if and when you want to do them and basically opt out of anything that makes you feel stressed, it's a different matter.
Looking after yourself is a good thing, but it is bad for the mental health of others if they are always taking up the slack when people drop out or let others down, and there are times when 'being kind' to them just encourages that selfish behaviour.
Also, those with real MH problems are tarred with the same brush, so it is more difficult for them to get a fair deal if people associate things like anxiety and depression with that sort of behaviour.