It is always good you store your airdrops on a different device to avoid your wallet being hacked, just like the mistake you did, thanks we're smart enough to have noticed that something has gone wrong. The security of our wallets are very important and so full care and concentrations must be put to place for our wallet safety, if not we end up losing all we have worked for within a short time frame, and that is why you stay out of links, apps and websites that are not that important to you.
Airdrops are mostly useless and you should never try airdrops if the risk is losing your bitcoin by hacks. If you can not have a device used only for airdrops, don't join airdrops.
Security of Bitcoin wallets, and cryptocurrency wallets depend on their blockchain protocol, security and the device security. If you have bad habit on Internet, and your device was infected by malwares, viruses, I am quite sure that your Bitcoin and cryptocurrency wallets will have higher risk of hack and steal.
Bitcoin security and resources.