I took parenting classes many years ago as a single Mom of four children and they taught me to be tough and consistent and to always say 'I love you, but right now I do not like your behaviour.' It is important to teach the child that they are always special and important but their behaviour and manners must meet up to your standards of approval. It is ok to say No, don't touch, please stop, you must not do that, listen to me, let's talk about this - depending on the age. I look the child in the eyes, hold their hands in mine and talk to them seriously when we have a problem, then let them go on their way. Toddlers have very short attention spans so you have to address the problem right away then move on.