You in Japanese

I heard from a different person who does video lessons about using non-keigo "ne" and "da ne" to sound more feminine or masculine, like a female may say "sou ne" whereas a male may say, "sou da ne." What is your view of this?

あつい ですか?
Atsui desu ka?

Atsui desuka?

Atsui desu ka? For when you want/need to use keigo

Atsui? For when you are with close friends (not using keigo).

Been awhile since I've done actual sentences. I might need to relearn it all again, but here goes:

– 熱いですか？

– Atsui desu ka?

Atsui desu ka?

暑いですか？
ゆたさん、ありがとうございます。

Atsui, desu ka?

Atsui desu ka

暑いですか？
…
ああ、とても暑いね～－＿－；
(でも、ここ寒いです。） Okay, enough of that. sorry XD