I get a feeling I am joing trapped giveaways

read descriptions and follow them if creators requires something, just that. ¯\_(ツ)_/¯

And now there are some other ones with cryptic messages about auto joining scripts.

Autojoining is against SG rules, but so is calling out. If they're claiming you're breaking a rule, then report them, which is what they should be doing if they suspect you're breaking a rule.

As I join manually how am I meant to be able to tell if it is a trap?

No idea what that even means. People blacklist people for any number of reasons - if you have a bad ratio, don't say thank you, spam the same comment in all their giveaways, wear yellow on Tuesdays, or have Mr Awesome as your avatar. Who knows.

I read the description and say thank you etc, so guess it must be that yellow shirt I wore last year?

e.g.
[link I was unware I could not post for some reason]

I have no idea what th description is hinting at

There is a lot of them currently listed here [link I was unware I could not post for some reason]

*joining
How long ago was that win?

The calling out rule is really nebulous and regularly used to the detriment of discussion, but better be safe than sorry...
Whenever there's a chance of someone misinterpreting your reference of someone else or their statements as calling out, you are better of not doing it.

Back when I used to blacklist for ratio (I eventually stopped doing that in favor of either not caring or using SGTools), my winners were basically the only people I did actually check, so it could be just that, really.

My guess is your ratio.

I just use a mod that adds a "JOIN" button. Why should I be punished? I mean the website is already skimming for bots right?

It happened to me too, but I don't have third programmes. I usually join "invite only" giveaways, and I won one game of that type of giveaways, and got blacklisted. I think it could be because I'm a ghost who only joins giveaways, and didn't say anything in forums xD

you must say something a bot never would, such as "how do you do, fellow humans" or "i enjoy the visual sensation of this juvenile feline"

You really should not think to much about it. When you get blacklisted for the first couple of times you think what the hell did i do to these people. SG has one million user accounts, so a couple of BLs doesn´t mean you are a bad person. Everybody got some. You don´t have multiple or unactivated wins and no vac bans. It´s hard to imagine that you managed to offend people with 77 comments. And 12k entered GAs in 2 years does not seem like you´re using auto-join scripts. So what´s left, your ratio? Some may say it´s low but i don´t think so. You have given away games by yourself, most of them public and barly without restrictions. I have no script to check if you played your wins. Some people care a lot if their GA just ends up to be another +1 to someone´s library but if you get blacklisted right after the GA ends, then it´s for some other reason i guess. So relax, you can still use ESGST and hide your BL graph :D