I'm going to rant a little - do not read this if you will get mad. I need to get it out. Do not trade me if you are going to act like this as well. If it is against the rules a mod will tell me, not you.
I don't care why people do these or what their reasoning is for doing so. It annoys me so much when people do:
1. Leaving NFT pets unlocked.
This bothers me so much because there was an option to lock these pets. This was specifically designed so that you don't get trades for pets that you don't want to be offered on. Lock it if it is NFT. Showcase is completely stupid as well - it is just rude and tempting and you're asking for any trades for that pet to be sent to you, so don't get mad when someone sends you a trade offer for them. I have plenty pets that I know people would want, but I lock them because I don't want to trade them. If you want to show them off, but them in your signature or trade thread. It's just rude.
2. Leaving trades to rot.
If you are either going to leave trades to rot, then don't ask for trades. You obviously don't care whether or not a trade gets accepted, so don't ask for them in the first place. And don't get mad when someone PMs you reminding you of your trade - it's your fault, and half the time you're online but just don't feel like responding.
3. Saying "no suggestions"
This is just stupid. Saying no suggestions is basically saying that you don't want to trade. Sometimes, people truly don't know what to give. Not only that, but if you have a ton of pets it's hard to constantly go through them all. If you're not willing to edit the trade and work something out, then don't ask for trades. Don't expect someone to do all the work for you. Being on mobile is NOT an excuse. I am on mobile all the time and I still edit trades as well as send messages. Therefore, it shouldn't be that hard for you.
4. Cancelling/accepting without a message.
This one is one of the worst. Give me a reason why you cancelled - just like how your rules say "leave a message", I would like you to leave one too. It's not that hard to leave even a simple "no thank you". Not only that, but if I send you a great trade and you accept without a message, it makes me regret because you obviously weren't appreciative. It's not that hard to write 2-3 words and hit a few buttons.
5. Foe-ing over a stupid trade.
If someone sends you a bad trade, just tell them you weren't interested - there's no need to foe them. Not only this, but if someone reminds you of a trade you left to rot, don't foe them for trying to work something out. What's the point of trading if you're just going to foe everyone. Do not ask for trades if you are going to foe someone for breaking the slightest rule.