Villa's disgruntled fans accosted captain Richards, protesting against the club's poor form.
Garde accepted the club must simply accept the protestations of supporters, and keep beavering away to turn their poor campaign on its head.
"We have to accept that, as a player, a manager, everybody at the club has to accept that criticism, because we are not winning - that's football," said Garde.
"The situation with Aston Villa is very difficult and makes some silly things happen sometimes.
"Everybody has to keep calm, face their responsibilities, look in the mirror and ask themselves what they can do to get out of this difficult situation."