Welsh speaker here. It's completely untrue to say that the only times we speak Welsh in public are to annoy boorish English visitors. But it is true to say those are the *best* times.
@fesshole Rydw i, ar brydiau, yn gwneud yr un peth yn Ffrangeg.

@HunterAnton

I've been known to do it in French to keep information from children, but otherwise it seems unnecessarily unkind.

@Eetschrijver @fesshole

@CppGuy
Believe me, there are times when you don't want people to know you speak their language.
@HunterAnton @fesshole
@fesshole speaking as a monolingual English person, fair play, more power to you I say.
@fesshole @tryst as an English speaker (not the Queen's English xD) I approve of this. xD
@fesshole Saesneg ydw i. Dydw i ddim yn deall Cymraeg.
@fesshole จริงด้วยครับ