Ex Dropping kids back

Based on the info you’ve provided, I can see why your partner wouldn’t be happy for you to continue a relationship with an active addict who by your own admission caused conflict in the recent past.

For me the issue would be the addiction and conflict - by giving lifts etc, does your partner maybe feel you’ve enabled your ex to continue with her unhealthy lifestyle?

If your partners ex is generally an ok person without the same drama or issues as your ex, then it’s lovely for the 17 yo to see her parents able to co-exist and be civil.
10 minutes of small talk to enable a decent co-parenting relationship seems reasonable.

It's better for all involved if everyone is civil.
It seems childish to not want to spare 10 minutes to talk to the children's other parent.

What do either of you think can happen during a ten minute chat?

Giving a previous partner lifts, especially one who is an addict is not on.
Parents briefly socialising when exchanging a child is common courtesy.
So to answer your question Yes you are being petty.

agree with above.

It isn’t odd, they have a child together and 10 minutes isn’t long to discuss what is happening in the childs life.

So don’t be petty.

Their daughter needs to see tgat her parents can be civil and therefore able to support her properly...rather than fighting and therefore not focusing in her needs!

Yes yab petty.

It’s important that the daughter sees her parents being civil to one another. Stop worrying & as others have said, being concerned. You’re acting “insecure”, & trying to change it comes over as controlling.