See, it's funny because covalent bonds are stronger than hydrogen bonds, and this 'cartoon' is using the weak versus strong password box that most of us are familiar with to comment on this strength difference.
Hydrogen bonds are usually considered to be intermolecular forces attracting separate molecules to each other (or parts of one molecule to different parts of the same molecule as in DNA and proteins' tertiary structures).
Covalent bonds, on the other hand, are intramolecular forces holding atoms together within molecules. They aren't usually considered IMFs unless we get into the grey area of covalent network solids.
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