The OP on Mastodon shared screenshots of the replies (can’t tell if they were originally in the forum post, or if it’s a DM):

https://nextcloud.aztinet.eus/s/sxqEDJDZGp7a9rx

The post on Mastodon has a screenshot of the post edit history:

And a copy-pasted response from a moderator (the most relevant bit):

So in my opinion, if your intention was to show political support for diversity, you should avoid using this flag. This will allow us to refuse the use of a flag for instance saying ‘non-queer’, If we allow your flag, then we have to admit also other similar political flags, both supporting and opposing diversity.

Not a fan of datalist:

• Barely works in Firefox (need to click again after initial focus);
• Doesn’t work at all in Firefox mobile (if there is some magic to show the options, I don’t know what is);
• In Chromium and Safari mobile (tested through appetize.io), I don’t like how similar it is to a select:

Somewhat liked Chrome’s implementation in Android: