(22 was to the OP btw)
I don't wanna play against Indians
Is there any to prevent it?
There is a two-step fool-proof method.
First, abandon on-line play completely.
Second, only play in small OTB tournaments and withdraw if you see other entrants you wouldn't want to be paired against.
Come to think of it, "fool-proof" might be replaced by "proven fool".
An alternate method is to get Doctor Emmett Brown to use his DeLorean to take you to when the makeup of OTB tournaments was different.

It's wanting to play rugby without ever meeting the Spingboxes or the Allblacks! Priority to the beautiful game, to chess genius, whatever the nationality of the player.

Is there any to prevent it?
If you report this topic for racism, @P82xChess won't be able to play against Indians because his account will be banned for abuse
I'm sorry but do I need to teach you math now? There are over 10 million Indians in chess.com so naturally even if 0.1% of people were stallers, India would have 10 thousand stallers. So just because you had a bad experience with 0.1% of Indians doesn't mean that the rest 99.9% Indians are stallers too.