Hello @Newbie09
Welcome to JustinGuitar and the Community Shruty.
It’s great that you have friends who also play and hopefully one day become jam buddies.
They may have learned things differently to Justin’s teaching methodology.
Bear in mind the old adage - if it sounds good it is good.
I often talk to my students about rhythm and strumming and allowing each to have a different sound.
I have included this in recent live club sessions too. Vintage Club #21 with Richard | Strumming Help
I call it Thicky-Thinny.
Not exactly technical jargon but I believe the name describes the concept nicely.
Allow down strums to target thick strings and up strums to target thin strings.
It brings tonal variety and dynamic qualities to your rhythm playing.
On many occasions, you will encounter songs where there is an up strum on the & after 4 and it is played with open strings as a chord change is made. That definitely should not be all six strings being hit, just two or three.