SHUT UP! The human guests are being mean to Flowey! Frisk, I know you're very determined. So can't you block the mean guests? I don't want to see anyone suffer like this anymore. Especially not a fellow flower. 

[RED ANON] Alright, let's say us guests are THIS coin. Now, on one side of the coin, we are helpful, caring, and overall generous. However, on the other side... We are cruel, tormenting, and even bloodthirsty. Up until now you've only seen the GOOD side of the coin. But unfortunately for Flowey.. IT'S PURE CHANCE.

[RED ANON] Now you can apply this metaphor to pretty much anyone, in this case let's say... YOUR GOOD FRIEND SANS. He has always shown you the GOOD side of the coin (well.. maybe the occasional glance at his dark side), BUT "OH POOR FLOWEY.." He only sees the BRUTAL side of SANS.