To paraphrase something Neil DeGrasse Tyson said to Richard Dawkins: If you want to change someone's opinion about something, you need to be sensitive to the state of mind of the person you're trying to convince.

Bashing and negativity is not the way to do it.

You'll get much farther showing a PHP person something more interesting (whether it be Rails, Django, or whatever) and highlighting all the cool things about it. Because that person will not be on the defensive, his/her mind will be way more likely to have that 'Wow, that's so cool I should try it' moment.