Again it's OK if someone is posting only because in support of Son and not necessarily for the club. Fans who fall into this category generally would want to see the club succeed as well. Do you also want them not to attend our games/buy merchandises/promote player/club? As long as they are not spamming/trolling try not to be annoyed by it.
Think about how someone becomes a club supporter. A connection/starting point has to be made somewhere especially if that person is not from the city let alone same country. The more you watch and follow a club there's a greater chance you will become attached to the club and eventually become a supporter especially if they don't currently have a club that they support. If their fav player leave will they stop supporting the club? Sure that can happen obviously but they could also remain a fan of the club don't you agree?
How do you think South Korea has huge Man Utd followers? Even after Park Ji Sung retired if you ask many of them they would still to this day Man Utd is their club of choice.
I'm not saying they don't exist at other clubs, of course they do. Doesn't mean I have to be fine with it though. Just as I'm sure Luvf doesn't give much of a crap what I think.
It wouldn't even bother me, other than the fact that in general Son supporters think he's a living God and will blame anyone and anything else when he plays crap and is called out for it.