Don't you think is rude?

I don't find it overall particularly rude as such. Unless of course their quite rude about saying 'hey check out my channel its 'effin great'. Some people just aren't so nice about trying to promote their own channels. S/he is probably trying to get onto the partnership program (I find forum trolls posting their link continually are infact trying to get a partnership and or subscribers) and they are failing miserably. What I do find rude (from what you say happened) is the way he approached the subject. If he was 'helping' you by suggesting to look up the walkthrough on youtube then thats good. But why not give you a link and THEN say hey would you mind checking out my channel? I personally would do it that way as the chances of him getting a few hits/views is greater than what it would be the way he approached it.

Hi Trinity, That is very usual in most forum site. There are people who would put links of their site without any permission. What I hate most is, some of them will send me PM about their program and wanting me to be their referral. I think some people will do anything to earn online such as to get traffic on their youtube page or website.

Yes, I know what you mean. But well, that are cheap people. You can't expect more out of them to be honest.

I hate when people promote themselves on forums and chat rooms, no one cares about your website, let your traffic grow naturally! Yes this is pretty rude, I also hate when people do this with referral links.