Entirely with you Rosina. Even if the child had some learning or other developmental difficulty, his mother could have made some attempt to control his behaviour and/or offered the elderly lady (and you) a brief explanation/apology.
There is a family who come to the church I attend, who have a child of 2 1/2 - 3. They let him run round the church all through the service; up the central aisle, along in front of the seats at the front, down the side aisle along the back, again and again and again. They only retrieve him when he tries the join the priest on the altar. It is distracting. Other parents with children the same age keep them under control. Last weekend the disrupter walked up to one of the other children and tried, several times, to hit her. His parents did nothing.
I expect this is an example of bringing your children up in a peace and love life style, where any negativity is treated as oppressive as advocated by someone on another thread. Or bringing them up without any regard for other people, which is how I would describe it.