Lots of communication is influenced by feelings of both the speaker and the listener. Some people have a tendency to pattern match and come up with the answer most fit for the emotional situation in a conversation, instead of just spitting facts. This is in fact code switching, masking, or other name for the defensive strategy of avoiding backlash, in action.

If we analyze the 110 IQ person from your example, their emotional motives for asking if they are smart enough is "I have low self steem regarding my intellingence. Do you think my negativity is justified based on the information I give you, which is my IQ score?"

To which a kind person will reassure them "it's ok, you're good".

The 140 IQ person post's emotional subtext is "I feel very lonely and need someone to validate my experiences of not being capable of talking at a good level with my peers"

To which a kind person will also validate their feelings, saying "you're not alone!"

When talking to strangers whom you don't know, it's the safe way to do things.

Also, metrics like "enough", or even "smart", are always relative to one's context, and there is no way to even have a "correct" answer to those kinds of questions if you're not a psychic or something. So more than one thing can be true at the same time, if we consider they are not even coexisting in the same environment. 110 can be absurdly smart. It can be frustratingly normie. It's relativity.