There are always unknown/strange tokens airdropping to our ETH addresses. Just ignore them, there is no harm for the coins to stay in our wallets.
He can't do anything else either, there is no way to get rid of those tokens, unless he wants to spend gas for nothing. Also, you never know, maybe one day some of those tokens will have some value. In a way, this is a curious and cheap way to do marketing, they send tokens to random addresses so that the owners of those addresses look for information about the tokens and thus they know about their projects.