Green eyed or just being insensitive?

There's something that has been bugging me for the longest time

Sometimes I really dun understand y there r ppl who always gives a lot of comments on the things u do or the things u get ... N mind you it's nt exactly those nice hearing comments ...

But dats nt the main point ... The THING that BUGS me IS ... If they r so negative of the things that I did ... THEN Y R THEY DOING THE SAME THING? ( at a much later time of cuz ...) Did they forget what they've said? N then start to act like it's oh-so-right to do it?