The best try would be stopping your address to be posted publicly. Most of the people join a lot of airdrops and sadly most of these airdrops are scam. They wont pay you anything but will collect your address and later make you a target. I hope you got the point I'm trying to make here.
You are right and people can easily create a different wallet address for all these airdrops if they wish to participate in those airdrops to avoid exposing their primary wallet even though I have noticed that even with you partaking in any airdrops, some of them still manage to drop in your wallet but you can simply ignore them.