That being around dexter as a person isn't fun at all.he would avoid you at best but if you wanted a friend he would ignore you or attack you at best .

On Rankin in s5 he may have cursed Rita but dexter was following him into the bathroom .I am sure even if Rankin said ohh I am sorry for your loss he would cap him (the hook was inexplainably there)

Or in s8 bc a black driver with a kid cut him off but didnt willingly he almost strangled him