There are two things. One of the things the proposed definition does is it proposes including any proscribed “action, conduct or comment”. What that does is it provides a regulation-making power such that you could further define what is meant by an action, conduct, or comment. If at that stage you wanted to add in words such as “isolated or repeated in nature”, you could do that through the regulation-making power.
There's nothing preventing you from adding it in here as well, but our advice would be to leave it as broad as you can and use that regulation-making power, as time goes by, to see if you need to add additional boundaries around it to make sure that it's as all-encompassing as you wish.