Well, you could start by telling them that cold weather and cold temperatures can't make you sick! That's a common myth. In fact, it's possible that cold temperatures stimulate the immune system and boost metabolism.
As for the fact that styling straight is easier, I think the decision is purely up to you and what you want out of your hair. Decide what makes you happiest, and stick to it! Plus it's my personal theory that this process will become easier once I get better at it, and once my hair is healthier and less frizzy, but we'll see about that...
2b/c, med to high density
LCLF: fine, medium porosity, normal elasticity
Mod-CG: low poo & water washes, no co-washes
no sulfates, no silicones, no polyquats
HGs: FSG, gelatin PTs, pixiecurl diffusing
Growing out a chin-length bob, just reached collar bone length!