Why are words now underlined with popups in posts?

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you have a virus

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It's not really a virus, it's browser add-on malware.

quote:

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should have bought a mac computer

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Macs are susceptible to this type of malware, too. And if people like you keep spreading this misinformation that leads people into a false sense of security, the problem will continue to get worse for Mac users.

clear your cache

cleared it. Still doing it.

Type chrome://extensions in your address bar and disable anything you don't recognize.

Then install/update your malware scanner and run a full scan.

It'll probably comeback. You have a malware somewhere deeper.

Malware-Bytes, download it and run it.