There are regular active users with usernames of five years standing who have posted on multiple threads today alone , who have all used the "sniffing glue", "go see a psychiatrist" comments
Have you reported them?
If you see them regularly posting like this, have you reported them regularly?
MN is not and never has been a pre-moderated site. It would be impossible to be so as it's so big. So it's down to us as the content providers to report posts/posters that are against Talk Guidelines.
Sadly, MN is so large now that it's like any community in the real world - most people are nice, but some are not, and some are here only to goad and cause trouble. MNHQ do their best to deal with the trolls and goady posters, and they step in (when something is drawn to their attention) to deal with posts/posters that are 'not in the spirit' - but doing that objectively can be very difficult. As PP have pointed out, a lot of this is about tone, and not being able to read the tone right.
Also, however, some people just don't like it when they're disagreed with, or when direct, even strong, words are used in such disagreement. That's not bullying however.
Adding a like button will not help any of this - how could it? Are people going to press 'like' when they see someone being bullied? And you only have to look at places like reddit, with the up and downvoting, to see how this is used to be unpleasant!
The only way to deal with posts/posters that we believe are being unpleasant (or bullying, if you really think that's happening) is to report to MNHQ.
... and to remember, ourselves, to post more carefully and with consideration.