So you have traced your family tree back far enough to conclude what your ultimate ancestor was?
Why do you make this comment?
The whole point is that we all find the idea that at some point in the past a real, actual grandfather of ours was a lizard (or a reasonable facsimile of it) to be something significant. I think it is cool.
Clearly others do not find it so cool. It for them very unsettling. Of course, there are lots of truths that are unsettling; some of us deal with them and others have to hide from them.
We all hide from some truths. It seems some hide from more. Why someone can't deal with somethings is an interesting thing to explore with them. I don't see your comment helping with that explanation.
™ Version 4.2