YOU SAID:
My friend is really rude and I wish they wouldn't sit next to me
INTO JAPANESE
私の友達は本当に無礼なので、隣に座らないでほしい
BACK INTO ENGLISH
My friend is really rude, so please don't sit next to me
INTO JAPANESE
私の友達はとても失礼なので、私の隣に座らないでください
BACK INTO ENGLISH
My friend is so rude, please don't sit next to me
INTO JAPANESE
私の友達はとても失礼です、私の隣に座らないでください
BACK INTO ENGLISH
my friend is so rude please don't sit next to me
INTO JAPANESE
私の友達はとても無礼なので、私の隣に座らないでください
BACK INTO ENGLISH
My friend is very rude so please don't sit next to me
INTO JAPANESE
私の友達はとても無礼なので、私の隣に座らないでください
BACK INTO ENGLISH
My friend is very rude so please don't sit next to me
That didn't even make that much sense in English.