I think if people choose to post here about names then they are to some extent looking for others opinions or validation for them. If not, then I'd think they are maybe better off waiting till their LO is born and annoucing the name then. Posting here is bound to get some feedback and opinions. If you don't want other people to comment, then holding off and not telling people is maybe a possibility to consider. It's whatever each person feels comfortable doing.
Taste is subjective. Not everyone is going to comment with a positive and say they like a name, same as not everyone is going to reply and say they love it. If people have a list of names they are usually looking to see what others feel the best pick out of those. It's a bit hit and miss I always think, as even if one name is way out in front, it might still be the name that the parents like the least and vice versa. Not everyone is going to like the same thing, that's the beauty of it.
I like to think my replies are always considered and well thought out. I don't just say 'I hate it' or 'That's flipping awful' but if I honestly don't rate a name, then I am not going to lie about it. But I will be polite.
I personally don't feel anyone has been out of order by way of a reply. One or two comments possibly were a bit lacking in tact, but then maybe that is simply how the person making the post is, straight to the point and not worrying about being as tactful as others. It's not a terrible reflection on a persons choice of name, just a somewhat blunt reply. Forums have a way of bringing together people from all walks of life and of differing personalities. Sometimes not everyone is going to see eye to eye and sometimes feelings might be a little hurt, but at the end of the day, a blunt comment can be forgotten about easily enough. It's not something I would lose sleep over anyways. People are likely to do the same in real life face to face also, only there you also have the facial expressions and so on to go on. So someone in real life may balk at a name chosen or say they don't like it.
I try to consider people's personalities when I read their posts. You can often gauge to some degree how people are in how they write, so if someone does maybe offend/annoy me a little by being blunt/tactless but honest, then how can I be cross at them for being themselves? Posting anything on a forum can elicit a response, how others reading it interpret things, that's down to the individual. And how they then choose to react by way of reply or rebuke and so on....
Now my brain is thinking about this too much
I'll stop otherwise I could be analysing this for hours
Anyways, my thoughts are all there
Hoping I've expressed myself in a considered manner