G'day harangzsolt33,

"My past 10 or more posts have all received downvotes instantly. As soon as I press the button to Submit post, there is a downvote."

I strongly suspect this is an exaggeration. That's reinforced by, two sentences later, "instantly" being downgraded to "very quickly almost instantly". I understand that anger, frustration, and other emotions can colour what you write; however, this doesn't help your case. It's often a good idea (before posting) to leave what you've written, take a break, then reread and maybe modify the text.

Posts that I make are often voted upon very quickly: there's certainly nothing unusual about that.

"... yesterday I made a post around 1 am, and very quickly almost instantly it received a down vote. The post was quite long, so there is no way the person could have read it and thought about it and form an opinion so quickly."

It would be much better to provide a link to the node in question so that we don't have to (potentially incorrectly) guess. Also, PerlMonks is a global community; writing a time without any timezone information is not useful. My guess is that you are referring to "Re: PERL csv files to Excel".

That node originally had colouring which could have interfered with another monk's colour preferences (via Display Settings) resulting in rendering which was difficult to read. Far from needing time to read the post in its entirety, annoyance at being unable to read it at all could easily have resulted in a "very quickly almost instantly" downvote.

Claiming it was "quite long" is an understatement: it was excessively long; my response has fuller comments. Someone could have easily become fed up with the amount of scrolling needed and decided that a "very quickly almost instantly" downvote was appropriate.

All of that is, of course, pure conjecture; however, it does provide scenarios in which that post was quickly downvoted.

"... raise the awareness of the admins ..."

Please read "RFC: Policy regarding abuses of the voting system" — admins do monitor and are aware.

Many of your posts seem to be intended to antagonise. A couple of examples: colouring resulting in difficult or impossible to read text (e.g. Re^5: I prefer not to run the latest version of Perl because:); forcing large font code on readers (e.g. Re: Edit lines from a file and replace multiple lines.).

It's not impossible that you have sufficiently annoyed one or more monks that they are automatically downvoting any of your posts that they encounter. For instance, I upvoted a response you made to me (Re^5: PERL csv files to Excel) resulting in "Reputation: 0" — I don't see anything in that post that warranted a downvote.

In conclusion, I rather think that the ball's in your court: continue posting as you have been and downvotes will also continue; choose to play nicely with others and upvotes will accrue.