Your situation is the same as the situation I was in some time ago.
Back in placements for season 2 my friend and I did our placements separately. I landed at 2.3k and he landed at about 2k. We had another friend who was very good at FPS games and was at diamond but fell to 2.9k and hovered there. The 3 of us played together but never really climbed anywhere.
Friend 2 and I had a lot more free time than friend 1 so we played without him sometimes and by the end of the season I was plat, he was still diamond but properly in diamond. But friend 1 dropped to 1.9k. It was in the middle of this season where I tried to help friend 2 improve, such as asking him to install his mouse driver (which to this day he refuses to do for some reason) and lowering his sensitivity as he fancies himself as a hit scan player. But I was a very angry person then and got frustrated with him very easily which he would reply "its just a game, why are you taking it so seriously".
In season 3 both me and friend 2 had managed to get to master (thanks OWU), me in low master and him in high master. Seeing this friend 1 begged friend 2 to play with him because friend 1 thought he was in ELO hell all his teammates pick dps and there was nothing he could do. So we caved and had smurfs/alt accounts and boosted him to plat from silver where he placed but he was never satisfied with his rank and kept asking us to boost him more and more. Even while we were boosting him, we didn't win every single game and he got pissy with us because he thought we only lost because we weren't taking it seriously and our main accounts' SR aren't on the line.
While friend 2 didn't mind doing boosting someone, he had lost interest in OW and went back to playing CSGO and while I didn't want to boost someone, friend 1 thought I was boosted all the way to master by friend 2 and while it was never said out right, I think friend 1 thought he was better than me.
Only in season 5 me and new friends we met in the game were playing some quick play and while I was playing widowmaker, I was spectated by friend 1 who was a widow main (but only played support in comp). It was after a couple of minutes he said "Were you always so accurate?" A bit stunned by the question I just said "Yeah" but the real answer was that I had improved a significant amount from when I started playing and it was only when spectating me he realised the difference between us.
I definitely think you shouldn't be pushy with them, they will play the game how they want and there is nothing you can do to stop them. You shouldn't let the game get in the way of your friendship IRL as it did for me and friend 1 but you should let them know that your attitude towards the game is different from theirs and that even though the game will allow you to play with them, the matchmaking system will not be favourable to your stack and they will lose most of the time because of opponents just straight up outclassing them.
You could do what friend 2 and I did and have another account to play with your friends (I don't recommend boosting them though) just to have fun and put yourself in the same mindset as them. Just don't let it get in the way of your friendship which I think is more important than a computer game.