Positively negative.
A negative comment is only really negative if no one learns from it.
People will always be more likely to point out what you are doing wrong than what you are doing right. It is human nature to seek the errors in others.
For some this is because they truly feel they are being helpful by pointing out your flaws and they may well be. In these cases, the individual will be approachable, but often hard to convince from their opinion – right or wrong.
For a few, it is because they actually do know better than you do and are trying to educate you. These are usually very polite and open to constructive discussion.