He's an idiot. Personal perception of how something works does not make it fact.
While he has some valid complaints, he's blowing them way out of proportion. He reminds me of my father who whines about how his computer gets slow or broken because he plays around with things and doesn't understand what he's doing. He then blames the computer rather than accepting it's a PEBKAC issue. After the bajillionth time of fixing it, I finally told him to learn how to do it himself.
Any OS has its own quirks and issues. Stable is relative. Between Windows, VL and Mint, all 3 are stable and I have no issues at all with them.