Ignore, with as much aplomb as you can muster, if it was you.
That is, if you’re not with family, in which case you can say, ‘Hmm, interesting bouquet, that one,’ or some such.
The most embarrassing one I ever did was in a busy cafe at Heathrow, while waiting to meet dh.
Got up to check the arrivals board, didn’t realise floor was wet, slipped, very nearly went arse over breakfast time (as my father used to say), just managed to save myself, but at the same time let out a monumentally noisy one. ?
How I managed to summon the aplomb to keep going as if nothing had happened, I will never know.