Can someone explain why my housemates said this?

So all my housemates in Australia are basically Punjabi/Hindu. So we were discussing about cars and a housemate showed one car he was considering buying. Then they realised the seller was a Muslim by name.

The owner (he knows I’m muslim on paper, the rest don’t.) said “don’t ever buy/rent from a Muslim”

And my housemates responded “we wouldn’t even consider doing that in India, let alone here”

I asked them why but they didn’t elaborate just brushed it off.

To be fair I myself don’t interact much with Muslims on a personal level (because of judgement/preaching) but I am really curious to know why they feel that way?