Michael's also sells more than just the literal stuff in their store - they sell the entire notion of doing things yourself. It's no different. All it means is that "man crafts" have caught up to "woman crafts".
However, the main store behind the notion of DIY for men is Home Depot (and the other hardware stores). The inverse is shown here where the décor section usually takes up one isle.
We need to stop assigning gender roles to activities. I have a 20 month old son, and me and my wife try very hard to not genderize behaviours or activities.