Fair enough

There is a very large amount of studies that show that people like people that are like them.

The link you provide shows a coefficient of .47 for actual similarity, and .39 for perceived similarity. I'm not good at statistics, but that seems like a far cry from "the reason why people like other people is that they are like them." which is the line I was replying to. If I'm understanding it correctly it would be more accurate to say "people are somewhat more likely to like someone who is like them." If that's what was originally written, then I probably wouldn't have replied.