I support his/her suggestion. The client shouldn't judge your reasons for doing such a thing (not wanting to even see a nickname in any way), so (s)he thought it would be nice if it just offered the option. Which you, who doesn't support it, would choose to NOT USE IT if it's added.

Again, I say: you can't argue about the personal usefullness/value of this and that suggestions. It varies. You're not entitled to say which usage of any feature is wrong when it's exactly what a person wants and suggests.
Personal opinions about smilies, for example, don't count at the end. Principally since it would obviously be an OPTIONAL thing. No one would quit mIRC because of an OPTIONAL thing.
As for the ignore suggestion, "Why would you use this, some type of love affair?", damn, that's simply rude. Again, you show no respect at all.

If you managed to discuss POLITELY why should anything be added, rather than diminishing the suggestion with PEJORATIVE usage examples, then I'd say please go ahead. But you're not doing so.
Khaled already filters the suggestions himself. It's simple as that. Please stop trying to do this job. You'd fail with such rudeness, anyway.