I totally agree with you on this,but the question now is ?
How about one who actually have zero or no knowledge about the crypto but have an interest on investing so as to enable Him grow more weather?
If it's not going to take your time, then help that friend of yours.
Because with having that person wanting to trade from you with his/her fiat, all it takes is a simple yes from you. But if you're not comfortable doing that, you're also free to decline that.
You're in no obligation of doing the deal if it seems uncomfortable to you. However, if that person insists and really want to have it then just teach them how to buy in exchanges.