Why is it so , that people are always ready to correct others but wont really look at their flaws !!!

Of course if you do point out THEIR flaws, the feces hits the air circulator.

There is an old expression for this type of situation - "Can dish it out but not take it".

Makes them feel better, to point out others faults

They like to harvest all the souls they can get.

Because people aren’t ready to accept their flaws

You just described a large number of SW-ers

that* people* their* No space before exclamation mark. I'M A DEGENERATE!! ┬┴┬┴┤•ᴥ •ʔ/

Probably has something to do with their own ego, self-esteem.

Also, like @dondon said, it's much easier to blame and judge others than looking at your own behavior.

People are annoying and frustrated because of corona and do it even more now.

"Can't see the forest for the trees" Idiom

They wouldn't feel empowered looking at there own flaws,

That's much easier