I was at Men's Wearhouse and the man helping me made a strange comment after I said I did not want to apply for the Men's Wearhouse credit card. He said something along the lines of "Ah, you must be looking to buy a house soon". I said "huh?" and then he says something about opening the card beforehand and eluding to it being a bad idea for my credit score. Or that's how I interpreted what he said anyway.

I'm not even considering buying a place and don't know how he made that conclusion as for why I didn't want the Men's Wearhouse credit card. But it got me thinking what is he talking about. If I were to open a Men's Wearhouse card would it adversely affect my score?