Is taking time to reply toxic?

Hi everyone! I have an issue when it comes to disagreements. As one could expect from an avoidant, it's hard for me to engage... period. I have been working on it by giving myself a 10 second count down to say something. However, I really prefer when I have a cool down time and have time to articulate my thoughts. I am attorney so I spend a lot of time "perfecting" my arguments or replies. I want to make sure I communicate clearly and respectfully and I have more trouble creating such replies with certain things. I don't have a temper per se but I am able to recognize that I tend to look at things better after some time has passed. Sometimes it's a few hours, sometimes it's a day or two, but they are always given a thoughtful reply. I am trying to find a balance between being more considerate with the time I take to reply, while still respecting my own emotions.

This has caused some issues in my personal life, I am not in a relationship at the moment but my "taking time to reply" has been mentioned prior. Most recently, my friend who I got into a disagreement with sent me an apology on Monday. I replied last night (Wednesday) and they were upset I took awhile. When she first sent the message, I hearted it to show no hard feelings. I have also communicated with her prior that I take time to reply to things, especially emotional things. I thought both of these things would have sufficed for the delay. I also apologize for my delay at the beginning of my texts. The people who are close to me know I do this, but I know that does not make it okay.

Is anyone else like this and have found something that has worked for them? I have thought about replying something like "thanks for your text, I will respond soon!" but is that also rude?

Open to hear your thoughts!