There are a lot of things that could be funded with the $3.3 trillion in annual federal revenues. In 2016, the federal government decided to fund $3.9 trillion worth of things resulting in a $585 billion deficit.
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HTJ stated "...we choose increasingly not to budget properly for that, and waste the money on things, like walls, space exploration, and the military." Those three things are a small %.
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The key phrase being "...choose...to...not to budget properly..." The choice has been made to budget 67% ($2.6 trillion) on entitlement programs leaving little else for any other national  priorities.
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HTJ is stating the criticism that budgeting is not being done properly. I replied as to what the budgeting choices were, where current funding is being applied. HTJ pointing to walls, space and defense obviously fails to acknowledge that federal entitlement programs consume the vast majority of federal spending. Highlighting walls, space and defense while ignoring entitlements is fallacious.