"Ice cream is a bit, you know ... " he said.
Clarkson clarifies: "So you're saying all children are homosexual?"
"There's nothing wrong with it, but a grown man eating an ice-cream, you know it's a bit ... it's that way rather than that way," Hammond said.
Clarkson responds: "Welcome to the inside of Richard Hammond's head."
The clip has gone viral online and many poked fun at his views.
"Richard Hammond gags while explaining 'men who eat ice-cream are gay' on The Grand Tour, ep 6. Are men that watch this show bigoted weasels?" tweeted Hayden Scott-Baron.
Spigon Ruxide added:Someone tell Richard Hammond that if he finds himself wanting to shag men whenever he eats ice-cream it's proooobably not the icecream.
"We lost Prince, Bowie and Michael in a year where Richard Hammond can't eat ice-cream in fear of damaging his fragile & pathetic masculinity," tweeted Dean Eastmond.