I can't log into twitch here on opera GX. Is there a work around for their "supported browser" stupidity?

Yes, there are a few ways to work around Twitch's "supported browser" issue on Opera GX. One way is to use a browser extension or plugin that allows you to spoof your browser's user agent, making it appear as if you are using a supported browser. Another option is to use a browser extension that allows you to use Twitch on an unsupported browser, such as User-Agent Switcher for Chrome. Finally, you could also try using a virtual private network (VPN) to access Twitch from a different location where the supported browser is available. However, it's worth noting that Twitch does not condone the use of VPNs and may ban users for using them.