It looks like all of the comments you've mentioned are on your own posts, so the solution, in general, is that you should flag the ones you find "unfriendly or unkind" as... well... exactly that. (When you get 15 rep on a site, you can flag any comment there.) The flag menu is accessed by clicking the flag icon next to the comment you want to flag, but it can take some time for the flag to be acted upon because flags usually must be processed by moderators. If a moderator agrees with your flag they have two options: delete the comment or (if part of the comment is worth saving) edit out the bad part.
This process is the same for every single site.
It's a little unfair to blame the community at large though for this since it's a holiday and I suspect most people were out doing stuff (that's where I was at least; on any other day I would be lying in wait for posts on English). Plus the comments contained useful information, which is most likely why they were upvoted.
