Sound reasoning requires support.
I’m good at reading people. I’m not perfect at it, but more often than not I get it right. Like you, I’ve made a judgement about Vivek’s character. I could spend time identifying specific comments he’s made, mannerisms, etc. and micro-analyzing his behavior for you but the bottom line is my judgement is based on an intuitive assessment of a number of behavioral details. Whether that convinces you or not means nothing to me.