What is with the create a throwaway account to insult people thing? Karma isn't worth anything why not burn it under your real username?
It doesn't mean he's creating an account to troll necessarily, but to conceal his more reputable account from things we all know if possible; abuse. Something your parent doesn't seem to respect.
"I do not agree with what you have to say, but I'll defend to the death your right to say it." - Voltaire
Anyway, I tend to disagree. Reputation can do plenty to make a place worse - squashing dissenting opinions, incentivizing "gaming" of the system. I do my best to ignore these systems entirely.
Most corporations fail to realize this.
Only if it makes them valuable members of the community. If patio11(just as an example no offense) logged out of patio11 and logged in as a string of throw away accounts, then him valuing his account hurts the community. It incorrectly values the patio11 persona. It improves engagement of someone who is actively trolling. It actively encourages others to engage in such behavior.