When a narcissistic male demonstrates an inflated ego (often involves aggressive, anti-social behaviour) in a self-unaware attempt to 'prove' himself to be a badass alpha male - whilst at the same time extremely sensitive to even the mildest criticism.
In typical narcissist fashion, they feel the arbitrary need to dominate others in even the most trivial debates, and their Achilles' heel is basically anything that deprives them from their I'm-right-all-the-time mindset, and will stop at nothing to bully their enemies to 'reclaim' their manliness.
I can't stand Derek. It must take some serious small dick energy for him to not know how insecure he looks when he bullies others online.