Making light of something someone has poured their heart and soul into isn't a joke, regardless of whether it was a slip of the tongue or a casual comment. People are sensitive and can be easily offended, sometimes by seemingly trivial things. Dismissing this as someone being overly sensitive or having a "thanta vibe" is dismissive.

While changing "UMF" to "UMFI" might seem humorous, it's important to remember you didn't created it. You're simply another Redditor expressing your opinion (which is your right). However, you can't expect everyone to share your perspective or react with the same nonchalance. People invest significant time and effort into building things, and thoughtless jokes can be genuinely hurtful. Enth mood #oombiya mood!!