I'm not a morning person, so I do have sympathy, but I do think getting your kids to school in time for the first bell, well actually before the first bell is important.
Kids make use of the few minutes before the bell is rung to meet with friends, run off some energy and get into the school vibe.
Arriving at the last minute, all be it not quite late, can disrupt how a child prepares for their day. This is turn can change the atmosphere as of the class room as they start their day.
Our school now shuts the gate at first bell and any children arriving after this have to go through the office to get to their class room, it makes for a more ordered and relaxed start to the day
Only you can decide if 2 minutes more in bed, drinking your coffee, or in my case running round tidying the kitchen, is worth affecting your child's start to the day.
The mums you meet I. The playground, may want to say all I've just said to you, but they haven't got the time, so just shout a throw away comment.
You have various options, continue as you are now and grow a hard skin, think up some off the cuff replies, or change your routine to shave 2 minutes off the pre school rush and get there earlier.l