Y words (f**, Bit*ch) r considered unethical & toxic in society

that's just a discussion to understand the thoughts upon words like : f**k u , son of bit*ch , motherf**ker , f**king bit*ch ....
as these words r used during the fun and fight
but the question is :
Y these words r considered uncivilized in our society as these words r the part of our daily language , while from civilized to uncivilized ppl of society use them

Note : it is't a debate but a discussion , all of us r free to mention rational words below even in comment box too.
honorable judges and voters dos't need to struggle to decide winner , just stay away from that bussiness