One is following Christ, the other is working for the devil brother.
There does appear to be a number of different posters as you say.
From time to time we see an atheist come to deliberately try cause havoc, we can tell a tree by it's fruits.
There does appear to be some who prefer to throw negatives at everything.
There are some that try to preach to the converted.
There are some that think they know and don't want to accept anything else that is said in The Word, no matter how many verses are quoted or different angles we may share.
There are others who share in love, but we can all make a mistake, are we apologetic if we do showing God's Love in us. Every day is a school day, I believe every day we can learn something new, more so with The Word, as the Holy Spirit can reveal a Truth to us at any time.
All that said brother, we are all at different ages, different stages in our faith and growth in The Truth.
Bless you