Why is it that some songs are sneered at?

I like to sing an eclectic mix: traditional folk songs, chorus songs, popular songs from various periods, songs from shows, country/bluegrass songs, etc. This is only, I hasten to add, at clubs where a wide variety of songs and styles is performed and welcomed, not at traditional folk music events!

Now, there are 3 songs in particular that I've performed, where I've noticed various members of the audience sneering, grinning, shaking their heads, etc. (although others have enjoyed them, I know). And this terrible trio is:

Distant Drums (Jim Reeves)
Love Me Tender (Elvis Presley)
Feed the Birds (from Mary Poppins)

I wonder what it is that people hate about hearing these songs? They're all very good songs in their own right, even if you don't rate the original performers/contexts!

Okay, I'll admit that none of them is the 'height of cool', haha! But then neither are many songs that are sung at clubs.

So ... what is it about some songs that causes them to be sneered at?